The contemporary social moment in the United States has affirmed the critical importance of racial justice, and especially claims to justice informed by the contributions of structural and institutional forces connected with the nation’s original sin of slavery. In this paper, I examine the contributions of strict church–state separationism to the maintenance of slavery in the antebellum South in comparison to the contributions various forms of religious establishment made to the successful abolition of slavery in the United Kingdom and the British Empire. Developing a deeper historical understanding of the ways the relationship between religious and governmental institutions influenced the abolition and maintenance of slavery can assist the contemporary quest for racial justice.